Similar to the matching of 24 bit RGB visuals to 32-bit RGBA EGLConfigs, so X11 compositors won't alpha-blend any config with a destination alpha buffer during compositing.
Additionally this fixes failure to select ARGB2101010 configs via eglChooseConfig() with EGL_ALPHA_BITS 2 on a depth 30 X-Screen. The X-Server doesn't provide any visuals of depth 32 for ARGB2101010 configs, it only provides depth 30 visuals. Therefore if we'd only match ARGB2101010 configs to depth 32 RGBA visuals, we would not ever get a visual for such a config. This was apparent in piglit tests for egl configs, which are fixed by this commit. Signed-off-by: Mario Kleiner <mario.kleiner...@gmail.com> Reviewed-by: Tapani Pälli <tapani.pa...@intel.com> Reviewed-by: Marek Olšák <marek.ol...@amd.com> --- src/egl/drivers/dri2/platform_x11.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/src/egl/drivers/dri2/platform_x11.c b/src/egl/drivers/dri2/platform_x11.c index 8ede590b..d22b83f 100644 --- a/src/egl/drivers/dri2/platform_x11.c +++ b/src/egl/drivers/dri2/platform_x11.c @@ -782,13 +782,14 @@ dri2_x11_add_configs_for_visuals(struct dri2_egl_display *dri2_dpy, config_count++; /* Allow a 24-bit RGB visual to match a 32-bit RGBA EGLConfig. + * Ditto for 30-bit RGB visuals to match a 32-bit RGBA EGLConfig. * Otherwise it will only match a 32-bit RGBA visual. On a * composited window manager on X11, this will make all of the * EGLConfigs with destination alpha get blended by the * compositor. This is probably not what the application * wants... especially on drivers that only have 32-bit RGBA * EGLConfigs! */ - if (d.data->depth == 24) { + if (d.data->depth == 24 || d.data->depth == 30) { rgba_masks[3] = ~(rgba_masks[0] | rgba_masks[1] | rgba_masks[2]); dri2_conf = dri2_add_config(disp, config, config_count + 1, -- 2.7.4 _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/mesa-dev